Telegraphic transmission of pictures



Feb- 11, 193 w. SKAWRAN Erm.

TELEGRAPHIC TRANSMISSION OF PICTURES Filed May 29, 1928 Patented Feb. 11, 1930 UNITE STATS WILLY SKAWRASN, OF BERLIN -NIEDERSCHON HAUSEN, AND OTTO STEINER AND WTLLY LOHS, F :BERLINCHARLOTTlillflB'tTIltCv, HALSKE, AKTIENGESELLSCHAFT, OF SIE CORPORATION DE GERMANY GERMANY, ASSIGNORS T0 SIEMENS E TELEGRAPHIC TRANSMTSSION OF PICTURES Application led May 29, 1928, Serial No. 281,422., and in Germanyr June 2, i927,

Our invention relates to improvements in the telegraphic transmission of pictures.

Picture drum arrangements for picture telagraphy wherein the picture drum is provided with a hood enveloping it, into which the drum is inserted in the dark room, so that it can be inserted in daylight into the Areceiving .apparatuss are already known; 'l` he present invention concerns a special design and construction of this casket br hoodE that can easily be manipulated and above all ensures a safe protection against inadvertent exposures of the light sensitive film.

` The drawing shows an embodiment of the l invention'as an example Figure l shows an embodiment of the invention in longitudinal section9 Figure 2 is a top view thereofq Figure 3 is a detail of the embodiment,

viz z-the drum carrying shaft, and

Fig. i shows anotherl detail of Fig. l on an enlarged scale.

rlhe stem of the shaft a terminates in a cone which carries the picture drum. The cone is hollow and is cut off or truncated at an angle and at the lowest place of the plane of truncation is provided a slot nl. The cone of the drum e, carries on its inside a pin f that slides, when the drum is pushed onto it along the rinclined surfaceof truncation c thereby turning the cone, finally drops into the slot d. By this means the abutment or register of the picture comes always into the same angular position in relationto shaft 5 a, and if the shaft a is always coupled by e receiving spring and groove the i tion in relation to one The casket o ratus during exposing the drum to the light the cylinder of the hood and the guide cylinder are provided vat some place with an excision or slot a'. rThis slot is closed as against light by a shutter c, as lone' as the casket is not inserted into the exploring apparatus. rThe shutter is shaped as part of a cylindrical surface and is xed to the cover Z of the hood cylind r, with which it can be displaced in relation to cylinder g. The lower seal of the casket or hood is formed 4by the drum itself, its edge m forming a light impervious seal against the edge n of the casket. To obtain this result the thread p is screwed into the drum by means of the knob o. By drawing up the knob o the drum is lifted off the cone and is drawn out of the apparatus with the casket. A spring g is provided to prevent openingof the seal at m while doing so. ln the dark room the drum can be extracted from the casket by unscrewing the screw y?.

ln the same manner the drum is, after insertion into the exploring apparatus, detached from the casket and pushed onto the cone b of the ydriving shaft, by a simple turning of the knob 0 'fhe following safety devices, serve the purpose of preventing an inadvertent exposure of the light sensitive film or paper clamped on the drum. llllhen the casket or hood is removed from the housing 71 a pin r vertically movable in the cover Z of the casket or hood (see Fig. 4l) and depressed by means of a spring, engages into a hole t provided at the edge u of the hood' g and thus makes a rotary movement of the cover Z with respect to the hood and thereby the opening of the shutter 7c impossible. pin v in the apparatus housing 7L itself releases this lool:- ing device when the casket or hood is inserted in the housing7 by pushing pin r out of the hole t. Y I

When the hood shutter ic is opened, the nose fw is caused to lie under the projecting edge a2, that is firmly fixed to the housing of the apparatus. It is thus impossible to entract the casket or hood as long as the shutter is openn lt would however stili be pos` MENSSTADT, NEAR BERLIN, GERMANY,

sible to draw the casket or hood out after closing the shutter, without the lcli-uni being fixed in the casket or hood. This possibility is prevented by means of lever y. By means of the spring a the exteremity oi-this lever is pressed into a hole j at the edge of the casket or hood and the rotation of the cover Z is blocked so long till the knob o by screwing the thread p into the drum, actuates the lever y, and releases the connection between the cover and edge of the casket or hood.

The invention may, besides its application to picture rolls used in picture transmission, also be applied to oscillographs.

Various modifications and changes may be i made Without departing from the spirit and o the scope of the invention, and We desire,

said hood together With said drum from said housing only when said aperture in said hood is closed by said shutter.

2. Inapparatus for the tclegraphic transmission of pictures, a picture'drum, a hood impervious to light provided with an aperture and adapted toenvelope said drum, a

shutter for closing said aperture, a light imn pervious housing adapted to house said hood,`-

and means for permitting the removal of said vhood together with said drum from said 1 housing only When said aperture in said hood is closed by said shutter, said hood remainl ing immovable after insertion into said housing, While said drum is adapted to be p fixed on its spindle in a correct phase relation.

In apparatus for the telegraphic-transmission of pictures, a picture drum, a -hood impervious to light provided with an aperture and adapted to envelope said drum, a shutter for closing said aperture, a light imy .pervious housing adapted to house said hood and including a guiding cylinder, means for permitting the removal of said hoodtogether with said drum from said housing only when said aperture in said hood isclosed by 'said shutter.

fl. In apparatus for the telegraphic transmission of pictures, apicture drum, a hood impervious to light provided withv an aperture and adapted to envelope said drum, a shutter for closing said aperture, 'a light impervious housing adapted to house saidhood and including a guiding cylinder, said` iding cylinder having a slot in registry wit the aperture in said ood, said slot and-aperture extending parallel to the common axis of said hood and cylinder, and means for permitting the removal of said hood together with said drum from said housing only when said aperture in said, hood is closed by said shutter. l

5. In apparatus for the telegraphic transmission of pictures, a picture drum, a hood impervious to light adapted to envelope said drum, a light impervious housing adapted to house said hood and including a guiding cyll inder, both .said guiding cylinder and said hood having at the identical place a slotV parallel to the common axisfa shutter shaped corresponding to the peripheral surface of said hood and adapted to control said slot, and means for permitting the removal of said hood to ether with said f ruin from said vhousing on y when the slot in said hood is closed by said shutter.

G. In apparatus for the telegraphic transmission of pictures, a picture drum, a hood impervious to light adapted to envelope said drum, a light impervious housing adapted to `house said hood and including a guiding cylinder, both said guiding cylinder and said ,hood having at the identical place aslotparallel to the common axis, a shutter shaped corresponding to the peripheral surface of said hood and adapted to control said slot, a cover for said hood rotatable With respect thereto, means for rigidly connecting said shutter With said cover, and means for permitting the removal of said hood together With said druin from said housing only when the slot in said hood is closed by said shutter.

` 7.' In apparatus for the telegraphic trans: mission of pictures, a picture drum, a hoodA impervious to light adapted to envelope said drinn, a light impervious housing adapted to house said hood and including a guidm cylinder, .both said guiding cylinder an said hood having at the identical place a slot parallel to the `common axis, a shutter shaped oo rrespondi-ng to the peripheral surface of said hood'and adapted to control said slot, a cover apparatus for theI telegraphic trans. p

iis

inderboth said guiding cylinder and said hood having atl the identical place a slot parallel to the common axis, a shutter shaped 'corresponding to the peripheral surface of said hood and adapted to control said slot, a cover for said hood rotatable with respect thereto, means for rigidly connecting said shutter with said cover, said hood having an aperture on the side at which said shutter is located, and a spring-controlled pin fas-- 9. In apparatus for the telegraphic transmission of pictures, a picture drum, a hood impervious to light adapted to envelope said drum, a light impervious housing adapted to house said hood and including aguiding cylinder, both said guiding'cyllnder and said hood having at the identlcal place a slot parallel to the vcommon axis, a shutter shaped corresponding to the peripheral surface of said hood and adapted to control said slot,

a cover for said hood rotatable with respect thereto, means for rigidly connecting said shutter with said cover, said hood having an aperture on the side at which said shutter is located, a spring-controlled pin on said cover adapted to engage said aperture when said shutter, is in the closed position and saidhood is taken out of said housing, a threaded p0rtion upon the end of said drum facing the cover, and a spring-loaded screw passing through said cover and arranged to engage said portion and operative to draw said drum towards said cover.

10. In apparatus for the telegraphic transmisson of pictures, a picture drum, a hood impervious to light adapted to envelope said drum, a light impervious housing adapted to house said hood and including a guiding cylinder, both said guiding cylinder and said hood having at the identical place a slot parallel to the common axis, a shutter shaped corresponding to the peripheral surface of said hood and adapted to controlsaid slot, a cover for said hood rotatable with respect thereto, means for rigidly connecting said shutter with said cover, said hood havingan aperture on the side at which said shutter is located, a spring-controlled'pin on said cover adapted to engage said aperture when said shutter is in the closed position and said hood is taken out of said housing, a threaded portion upon the end of said drum facing the cover, and a spring-loaded screw passing through said cover and arranged to engage said portion and operative to draw said darum towards said cover, and a projecting border l at the other end of said drum adapted to form a li ht-(proof seal with the adjacent edge of the oo 11. In apparatus for the telegraphictransmission of pictures, a picture drum, a hood impervious to light adapted to envelope said drum, a li ht im rvious housing adapted to house sai hoo and including va guiding cylinder, both said guiding cylinder and said hood having at the identical place a slot parallel to the common axis, a shutter shaped corresponding to the fperipheral surface of said hood and adapte to control said slot, a cover for said hood rotatable with respect thereto, means for rigidly connecting said shutter with said cover, said hood having an aperture on the side at which said shutter is located, a spring-controlled pin on said cover adapted to engage said aperture when said shutter is in theclosed position and said hood v is taken out of said housing, a threaded portion upon the end of said drum facing the cover, and a spring-loaded screw passing through said cover and arranged to engage said portion and operative to draw said drum towards said cover, a projecting border at the other end of said drum adaptedto form a light-proof seal with the adjacent edge of the hood, and a spring loaded lever mounted on said cover and adapted to engage an aperture in a part connected with the cylindrical part of said hood to prevent the turning movement necessary for the removal of said hood from said housing.

12. In apparatus for the telegraphic transmission of pictures, a picture drum, a hood impervious to light adapted to envelope said drum, a light impervious housing adapted to house said hood and including a guiding cylinder, both said guidin cylinder and said hood having at the identlcal place a slot parallel to the common axis,'a shutter shaped corresponding to the peripheral surface of said hood and adapted to control said slot, a cover for said hood rotatable with respect thereto, means for rigidly connecting said shutter with said cover, said hood having an aperture on the side at which said shutter is located, a spring-controlled pin on said cover adapted to engage said aperture when said shutter is in the closed position and said hood is taken out of said housing, a threaded portion upon the end of said drum facing the tation of said cover, said screw adapted to release said lever when operated to engage said drum, whereby rotation of said cover is prevented until said drumis connected to said cover.

In testimony whereof we aix our signatures.

WILLY SKAWRAN. OTTO STEINER. WILLY LOHS. 

